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Counter Bore
Spot Facing – Provides a true bearing surface for a washer.
Counter boring – Provides a recess for a bolt head, bushing or pin.
Tool construction
Similar to an end mill, cuts on the end.
Different from an end mill in that there is no cutting edge on the outside diameter.
Normally spiral angle of 15 degrees. Brass requires straight flutes.
Rotary table
Adding another axis to the mill
Speeds production of hole patters
Allows milling of curves, pockets, channels where not easily done otherwise.
Horizontal
Vertical
Fixture
Fixture Plate Chuck Toe clamp
Part Location
Co Axial indicator (Co-ax indicator)
Simple means of center locating in round parts.
May be run at LOW speeds when indicating
Process
Deck part using mill and rotary table Locate center C- bore to depth of .250